JP5340268B2 - LIGHTING DEVICE AND PROJECTION DEVICE PROVIDED WITH SUCH LIGHTING DEVICE - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lighting device and a projection device including such a lighting device.

High power light emitting diodes for operation in the amperage region have only recently been known. This high power light emitting diode requires corresponding drive control by power electronics. The electrical connection between the power electronics and the high power light emitting diode is realized by twisted lines in known systems. However, this is only a suboptimal solution in terms of high operational functionality and operational safety.

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a lighting device that enables high operational safety of a light-emitting diode module and that can be achieved at a low cost with as little effort as possible.

  This problem is solved by a lighting device having the characteristic configuration of claim 1.

  The lighting device of the present invention includes a power electronics module and at least one light emitting diode module. The power electronics module is electrically connected to the light emitting diode module by a flexible printed board. Thus, by realizing the connection line in the form of a flexible printed circuit board, high operational safety is possible. Further, this makes it possible to drive and control the high-power light-emitting diode with a high-speed control signal in a frequency region higher than 100 kHz.

Advantageously, the light emitting diode module is configured for operation with a current in the amperage region. In particular, the light-emitting diode module has at least one light-emitting diode chip comprising a plurality of light-emitting diodes, the light-emitting diode chip being configured for operation with a current of 1A or more, in particular up to 6A. Advantageously, the light emitting diode chip has an area of about 1 mm ² or more.

  In particular, the light emitting diode module can comprise at least two light emitting diode chips. As a result, an operating current in a two-digit ampere region is formed. By using a flexible printed circuit board as the connection line, it is possible to produce a low-ohmic and low-inductive connection with a simple design between the power electronics module and the high-power light-emitting diode even at such currents. It becomes.

  This provides a completely different frequency range and current compared to, for example, high frequency technology.

  Advantageously, a plurality of conductor paths are formed on the front and back surfaces of the flexible printed circuit board for signal transmission between the power electronics module and the light emitting diode module and thus for current transmission. Therefore, the conductor track is preferably provided on the back-to-back surfaces of the support material or support plate of the flexible printed circuit board.

  Advantageously, the support material of the flexible printed circuit board has a thickness greater than 30 μm, in particular greater than 50 μm.

  The support material for the flexible printed circuit board may include polyimide or be FR4. However, the supporting material of the flexible printed circuit board can be a simple insulating tape having a corresponding thickness. In the insulating tape, copper wires or copper plates can be advantageously formed as conductor tracks on the back-to-back surfaces, that is, the front and back surfaces.

  Even when the support material is configured as polyimide, copper plates can be disposed as conductor paths on the front and back surfaces.

  In particular, when the conductor path is attached to the front and back surfaces of the supporting material of the flexible printed circuit board, the flexible printed circuit board is configured as follows. That is, this flexible printed circuit board is configured for signal transmission with a rise time and a fall time of 15 μs or less, particularly 10 μs or less.

  As a result, high-speed driving control of the light emitting diode module can be realized in a time of less than 3 μs.

  Advantageously, the conductor track of the flexible printed circuit board is covered with a solder mask or insulating tape.

  The light emitting diode module can be releasably connected to the flexible printed circuit board. A releasable connection is understood to be a non-destructive and reversible connection and separation means. In particular, connectors, in particular flat connectors, can be arranged on the flexible printed circuit board, and these connectors form a releasable connector connection with the light emitting diode module. As the connection connector, for example, a 6.3 mm flat connector can be used.

  The connector, particularly the flat connector, is provided with an additional operation portion of a locking projection, so that the light emitting diode module can be connected with almost no force.

  This can prevent wear or damage to the components of the lighting device.

  In particular, the connector of the flexible printed circuit board is disposed on one surface of the flexible printed circuit board, and the conductor path formed on the opposite surface of the flexible printed circuit board has at least one interlayer connection hole passing through the support material. Via the vias, the assigned connectors can be electrically contacted.

  The light emitting diode module can also be fixedly connected to the flexible printed circuit board. Such unreleasable connection can be realized, for example, by soldering the light emitting diode module to the flexible printed circuit board.

  This can create a persistent electrical and mechanical connection and prevent unwanted release.

  The flexible printed circuit board can advantageously be inserted into a slit in the board of the power electronics module.

  In particular, the flexible printed circuit board is additionally soldered while being inserted into the board of the power electronics module. This can prevent damage to the electrical contacts, either removed or desired.

  The advantages of the configuration of the lighting device comprising a flexible printed circuit board can be recognized in particular in the possibility of low inductance, ie low resistance. Further, such connection variations can be easily manufactured, and can be realized at low cost.

  The connector on the flexible printed circuit board can be soldered directly onto the copper material of the conductor track, whether it is PIH or SMD as a high current connector. The thickness of the conductor track can have a value of 35 μm, 70 μm or 150 μm, among others.

  Another aspect of the invention relates to a projection device comprising a display unit and the lighting device of the invention or an advantageous embodiment of the lighting device of the invention. The illumination device is arranged to be positioned for illumination of the display unit. In particular, a projection device including a high-power light emitting diode can be realized in this way. The projection device can be configured as, for example, a rear projection television (RPTV). Another projector can be provided with the illumination device of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the schematic drawings.

FIG. 1 is a cross-sectional view of a flexible printed circuit board of a lighting device according to the present invention. FIG. 2 is a cross-sectional view of the flexible printed circuit board and the light emitting diode module of the lighting device according to the present invention. FIG. 3 is a plan view showing another embodiment of the flexible printed board of the lighting device according to the present invention. FIG. 4 is a schematic sectional view showing an embodiment of a lighting device according to the present invention.

Advantageous embodiments of the invention In the drawings, identical or functional components are provided with the same reference symbols.

  FIG. 1 shows a schematic cross-sectional view of a flexible printed circuit board 1. The flexible printed circuit board 1 has an electrically insulating support material 4 formed in a plate shape. A first conductor path 5 is formed on the front surface 2 of the support material 4, and a second conductor path 6 is formed on the back surface of the support material 4. These conductor tracks 5 and 6 are preferably formed as copper plates.

  The support material 4 can be polyimide. The support material 4 can also be a simple insulating tape as in the past. The conductor tracks 5 and 6 can each be covered with a solder mask or insulating tape. The thickness d1 of the support material 4 is about 50 μm in this embodiment. The thickness d2 of the conductor path 5 can be set to 35 μm, for example. The thickness d2 can be 70 μm or 105 μm.

  In FIG. 2, the schematic sectional drawing of another embodiment of the partial component of the illuminating device I (FIG. 4) of this invention is shown. A plurality of interlayer connection holes 7 that pass through the support material 4 are formed in the first end 1 a of the flexible printed circuit board 1, and the first conductor path 5 on the front surface 2 and the back surface 3 are formed by these interlayer connection holes. The electrical connection with the conductor path portion 51 on the upper side is realized. The conductor path portion 51 is assigned to the first conductor path 5 and is formed contactless with the second conductor path 6 on the back surface 3. The block-shaped copper element 8 is in contact with the second conductor path 6 and the conductor path portion 51 of the first conductor path 5 on the surface facing the back surface 3. The light emitting diode module 9 can be fixedly connected to the copper element 8 by soldering to the copper element 8, for example. FIG. 2 shows a separated state, that is, a state where the light emitting diode module 9 is not fixed to the copper element 8.

  FIG. 3 shows a plan view of another embodiment of the flexible printed circuit board 1. In this plan view, it can be seen that the first conductor track 5 has a plate-shaped configuration. Also shown is a conductor track portion 10 corresponding to the conductor track portion 51, which is in electrical contact with the second conductor track 6 disposed on the back surface 3 through the interlayer connection hole 7 '. Has been. Flat connectors 11 and 12 are electrically connected not only to the first conductor path 5 but also to the second conductor path 6 via the conductor path portion 10. The flat connector 11 is soldered to the first conductor path 5. Further, the second flat connector 12 is soldered to the conductor path portion 10. The two flat connectors 11 and 12 are formed as 6.3 mm flat connectors.

  Furthermore, the two flat connectors 11 and 12 are fixedly positioned on one side of the support material 4, in particular on the surface 2.

  FIG. 4 shows a schematic cross-sectional view of an embodiment of the illumination device I. The illumination device I includes a flexible printed circuit board 1 that can be realized according to the embodiment of FIGS.

Further, the lighting device I includes at least one light emitting diode module 9. The light emitting diode module 9 includes at least one light emitting diode chip, and the light emitting diode chip may have an area of 1 mm ² , for example. The light emitting diode module 9 is configured as a high output module, and is provided for operation by current in the amperage region. Particularly in the embodiment, each light emitting diode chip of the light emitting diode module 9 is configured for operation with currents up to 6A. In particular, the light emitting diode module 9 can include six such light emitting diode chips.

  The lighting device I further includes a power electronics module 13 having a board 14 on which power electronics components are arranged. Further, in the embodiment, at least one conductor path 15 is formed on the back surface of the board 14, and the conductor path 15 is in electrical contact with the conductor paths 5 and 6 of the flexible printed circuit board 1. For this purpose, in the embodiment, the flexible printed board 1 passes through the slit 16 and is inserted into the board 14, and is fixedly positioned by the solder joint 17 on the back surface. The solder joint 17 forms an electrical contact between the conductor path 15 and the conductor paths 5 and 6. As can be seen, the flexible printed circuit board 1 is completely inserted through the slit 16 by the second end 1b.

  With such a configuration of the illumination device I, the high-power light-emitting diode can be driven and controlled by a high-speed control signal of less than 3 μs in a relatively high frequency region higher than 100 kHz.

  The flexible printed circuit board 1 is configured for a signal voltage with a rise time and a fall time shorter than 10 μs.

  In particular, the illumination device I is arranged in the projection device and is positioned for illumination of the display unit of the projection device.

Claims (18)

In a lighting device comprising a power electronics module (13) and a light emitting diode module (9),
The light emitting diode module (9) is electrically connected to the power electronics module (13) by a flexible printed circuit board (1) having a low inductance ,
The light emitting diode module (9) is configured for operation by current in an amperage region,
For signal transmission between the power electronics module (13) and the light emitting diode module (9), conductor paths (5, 6) are provided on the front surface (2) and back surface (3) of the flexible printed circuit board (1). Formed)
A lighting device characterized by that. The light emitting diode module (9) has at least one light emitting diode chip comprising a plurality of light emitting diodes,
The light emitting diode chip is configured for operation with a current of 1 A or more,
The lighting device according to claim 1. The light emitting diode module (9) has at least one light emitting diode chip comprising a plurality of light emitting diodes,
The light emitting diode chip is configured for operation with a current of 6 A or more,
The lighting device according to claim 1. The support material (4) of the flexible printed circuit board (1) has a thickness (d1) thicker than 30 μm.
The illumination device according to any one of claims 1 to 3, wherein The support material (4) of the flexible printed circuit board (1) has a thickness (d1) thicker than 50 μm,
The illumination device according to any one of claims 1 to 3, wherein The flexible printed circuit board (1) is configured for signal transmission with a rise time and a fall time of 15 μs or less,
The lighting device according to any one of claims 1 to 5, wherein The flexible printed circuit board (1) is configured for signal transmission with a rise time and a fall time of 10 μs or less,
The lighting device according to any one of claims 1 to 5, wherein The support material (4) of the flexible printed circuit board (1) comprises polyimide;
The lighting device according to claim 4 or 5, wherein The support material (4) of the flexible printed circuit board (1) is an insulating tape;
The lighting device according to claim 4 or 5, wherein The conductor path (5, 6) of the flexible printed circuit board (1) is covered with a solder mask or an insulating tape,
The lighting device according to any one of claims 1 to 9, wherein The light emitting diode module (9) is releasably connected to the flexible printed circuit board (1).
The illumination device according to any one of claims 1 to 10, wherein Connectors (11, 12) are arranged on the flexible printed circuit board (1),
The connector forms a releasable connector connection with the light emitting diode module.
The lighting device according to claim 11. A flat connector is arranged on the flexible printed circuit board (1),
A releasable connector connection with the light emitting diode module (9) is formed by the connector.
The lighting device according to claim 11. The connectors (11, 12) are disposed on one surface of the flexible printed circuit board (1),
The conductor track (5, 6) formed on the opposite surface of the flexible printed circuit board (1) is allocated by at least one interlayer connection hole (7, 7 ') passing through the support material (4). In contact with the connector (11, 12),
The illuminating device according to claim 12 or 13, which refers to claim 4 or 5 . The light emitting diode module (9) is fixedly connected to the flexible printed circuit board (1).
The illumination device according to any one of claims 1 to 10, wherein The light emitting diode module (9) is soldered to the flexible printed circuit board (1).
The illumination device according to any one of claims 1 to 10, wherein The flexible printed circuit board (1) is inserted into the slit (16) of the board (14) of the power electronics module (13).
The illumination device according to claim 1, wherein the illumination device is a light source. A projection device comprising a display unit and the illumination device (I) according to any one of claims 1 to 17,
The projection device is arranged for illumination of the display unit;
A projection apparatus characterized by that.

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